A simple route utilizing surfactant-assisted templating sol–gel process for synthesis of mesoporous Dy2O3 nanocrystal

Sreethawong, Thammanoon; Chavadej, Sumaeth; Ngamsinlapasathian, Supachai

doi:10.1016/j.jcis.2006.03.060

Cited by 37 publications

(15 citation statements)

References 30 publications

(32 reference statements)

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“…Many of these rare earth sesquioxides have important uses that involve variation in temperature. For example, both cubic Dy 2 O 3 and Y 2 O 3 have a strong potential for applications in manufacture of superconductors, while the former is also used as a catalyst . High‐purity Dy 2 O 3 is also used as an antireflection coating in photoelectric devices and also for the measurement of neutron energy spectrum, as nuclear reaction control rods and as neutron absorbents .…”

Section: Introductionmentioning

confidence: 96%

Investigations of anharmonic effects via phonon mode variations in nanocrystalline Dy₂O₃, Gd₂O₃ and Y₂O₃

Sharma

Singh

Vijay

et al. 2017

J Raman Spectroscopy

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The nanocrystalline rare earth sesquioxides Dy2O3, Gd2O3 and Y2O3 have been investigated for anharmonic effects in the temperature range 80–440 K using Raman spectroscopy. These samples were cubic in structure under ambient conditions with particle sizes in nano‐range. The predominant Tg + Ag phonon modes of the samples primarily exhibited phonon softening in the investigated temperature range. However, the line width variations clearly reflected the variations in the effects of anharmonicity on these samples, and the related anharmonic constants were estimated. The mode Grüeneisen parameters required for these studies were deduced from our own high‐pressure data for these samples reported earlier. The line width variations for these samples were found to display similar trends; however, their magnitudes were indicative of the factors that are expected to contribute to the variation in phonon behaviour. Copyright © 2017 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 96%

Investigations of anharmonic effects via phonon mode variations in nanocrystalline Dy₂O₃, Gd₂O₃ and Y₂O₃

Sharma

Singh

Vijay

et al. 2017

J Raman Spectroscopy

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“…Cubic Dy 2 O 3 also has a strong potential for applications in manufacture of superconductors and also used as a catalyst. [2,3] In the form of nano-structures, it holds potential as a highly functionalized material as a result of both enhanced surface area and quantum confinement effects. Potential applications of Dy 2 O 3 in nano-powder form include its uses as dopants for fluorescent materials, as glass material with a Faraday rotation effect for optical and laser-based devices, as magneto-optical recording materials, and materials with a large magnetostriction.…”

Section: Introductionmentioning

confidence: 99%

Pressure‐induced anomalous phase transformation in nano‐crystalline dysprosium sesquioxide

Sharma

Singh

Dogra

et al. 2011

J Raman Spectroscopy

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The phase transformation in nano-crystalline dysprosium sesquioxide (Dy 2 O 3 ) under high pressures is investigated using in situ Raman spectroscopy. The material at ambient was found to be cubic in structure using X-ray diffraction (XRD) and Raman spectroscopy, while atomic force microscope (AFM) showed the nano-crystalline nature of the material which was further confirmed using XRD. Under ambient conditions the Raman spectrum showed a predominant cubic phase peak at 374 cm −1 , identified as F g mode. With increase in the applied pressure this band steadily shifts to higher wavenumbers. However, around a pressure of about 14.6 GPa, another broad band is seen to be developing around 530 cm −1 which splits into two distinct peaks as the pressure is further increased. In addition, the cubic phase peak also starts losing intensity significantly, and above a pressure of 17.81 GPa this peak almost completely disappears and is replaced by two strong peaks at about 517 and 553 cm −1 . These peaks have been identified as occurring due to the development of hexagonal phase at the expense of cubic phase. Further increase in pressure up to about 25.5 GPa does not lead to any new peaks apart from slight shifting of the hexagonal phase peaks to higher wavenumbers. With release of the applied pressure, these peaks shift to lower wavenumbers and lose their doublet nature. However, the starting cubic phase is not recovered at total release but rather ends up in monoclinic structure. The factors contributing to this anomalous phase evolution would be discussed in detail.

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“…3 and Dy 2 (OH) 2 (CO 3 ) 2 Á2H 2 O are some precursors used to prepare Dy 2 O 3 . But high temperatures used in this process lead to high degree of agglomeration which results in large particles [13].…”

Section: Introductionmentioning

confidence: 99%

“…The gel was obtained by aging at a proper temperature, and then it was calcined to remove the organic components. However, the method would produce narrow distribution of dysprosium oxide nanoparticles, but the precursors were expensive and also the process was time consuming [13,14]. Electrodeposition, a powerful and interesting process, can be applied in numerous fields [15].…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis, morphology and structure of Dy2O3 nanoparticles through electrochemical precipitation

et al. 2015

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The aim of this research was to introduce a new, facile and simple method for synthesis of Dy 2 O 3 nanostructures at room temperature. For the first time, galvanostatic electrodeposition was used to synthesize Dy 2 O 3 particles, and the influence of the current density on the structure and morphology of the product was studied. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET). The results show that the current density has little effect on the chemical composition but great effect on the structure and morphology of the samples. The average size of the particles decreases as the applied current density increases. The grain size of asprepared samples decreases from 500 to 70 nm when the current density increases from 0.5 to 6.0 mAÁcm -2 . To obtain oxide product, the as-prepared samples were heattreated at 1,000°C. The results show that the heat-treated samples have smaller particles. The XRD results show that the similar patterns are observed in the samples synthesized at different current densities, and the only difference from the JCPDS card is the ratio of peak intensities. With the increase in the current density, a decrease in the current efficiency is observed.

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A simple route utilizing surfactant-assisted templating sol–gel process for synthesis of mesoporous Dy2O3 nanocrystal

Cited by 37 publications

References 30 publications

Investigations of anharmonic effects via phonon mode variations in nanocrystalline Dy₂O₃, Gd₂O₃ and Y₂O₃

Investigations of anharmonic effects via phonon mode variations in nanocrystalline Dy₂O₃, Gd₂O₃ and Y₂O₃

Pressure‐induced anomalous phase transformation in nano‐crystalline dysprosium sesquioxide

Facile synthesis, morphology and structure of Dy2O3 nanoparticles through electrochemical precipitation

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A simple route utilizing surfactant-assisted templating sol–gel process for synthesis of mesoporous Dy2O3 nanocrystal

Cited by 37 publications

References 30 publications

Investigations of anharmonic effects via phonon mode variations in nanocrystalline Dy2O3, Gd2O3 and Y2O3

Investigations of anharmonic effects via phonon mode variations in nanocrystalline Dy2O3, Gd2O3 and Y2O3

Pressure‐induced anomalous phase transformation in nano‐crystalline dysprosium sesquioxide

Facile synthesis, morphology and structure of Dy2O3 nanoparticles through electrochemical precipitation

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Investigations of anharmonic effects via phonon mode variations in nanocrystalline Dy₂O₃, Gd₂O₃ and Y₂O₃

Investigations of anharmonic effects via phonon mode variations in nanocrystalline Dy₂O₃, Gd₂O₃ and Y₂O₃